reminds me of another clip i've seen in which a guard/policeman at a hospital shot a father holding his newborn baby with a taser because he wanted to take the child home after his wife had complained about the hospital staff or something along those lines. Ended up with the baby smashing its head on the ground in a similar fashion and apparently continues to suffer effects from the injuries.
Imo, tasers should be treated no different to guns, if there is an imminent threat to an officers life then so be it, but it seems they are increasingly been used as tools to solve an incident faster as apposed to solving it in a safe and sensible manner.
Fingers crossed I never get caught naked on a roof :X